Aditional shortcut for Grab+Axis
Additional bindings for existing operations can be added in the Keymap Preferences.

Open up Edit > Preferences, and on the left column select 'Keymap'.

You can search for operators by name, although that doesn't help if we don't know the name, of course. It appears the one you're looking for is under:

&gt; 3D View &gt; Mesh &gt; 3D View Tool: Move &gt;


Under a plethora of options for this tool, there's a section further down that says 'Transform Modal Map', which lists all the bindings for all the sub-parts of the move tool. And at the very bottom of that binding list, there's a button 'Add new' which allows adding extra keybindings.

Set your new binding to the desired keys, performing the same actio that the existing G, X, Y and Z keys are set to already.